Machine tool



0 6 7, 1 4 q, 1l l.. A TL E0 M Ot E Hm IH H SM |.M S F..

Jan. 9,y 1923.l f

2 SHEETS-SHEET l..

FILED AUGULHQU.

L.. A TlL E0 O STI .mi EW IH H SM .M S E...

Jari, 9, 1923;

FILED Mme, 1917.

2 SHEETS-SHEET 2..

Patented Jan. 9, 1923. y

* UNITED STATES Param" carica.

FRANK S. SHIELDS AND JOHN A. CAMM, OF CLEVELAND, OHIO, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE CLARK & MESKER MILLING MACHINE COMPANY, VOIF CLEVELAND, OHIO, A CORPORATION OF OHIO.

MACHINE TOOL.

v@plie-acum med August e, 1917. serial No. 184,549.

fo all whom t may conce/'n Be it known that we, FRANK S.. frriinnns and JOHN A. CAMM, citizens of the United States, residing at Cleveland, in the county et Cuyahoga and State of Ohio, have in v `against rotation while the `arbor and work are adjusted with reference to the spindle, the locking means being interloclred with the power clutch in such manner that the clutch cannot be thrown in to start the machine while the spindle is locked and the spindle cannot be locked while the power clutch is in engagement with the power shaft.` The objectot` the `invent-ion is generally to improve the locking devices and linterlocking; connections, especially those devices which are adapted to the purpose above set forth, the improvements particu larly residing in the simplicity of the parts and their arrangement whereby they may be manufactured at a minimum cost assembled with a minimum expenditure of time and labor.

For a better understanding of the novel `features of this invention as above set forth and others which will appear hereinafter, reference may be had'to thedrawings accompanying this specification lwherein Fig. 1 vis a side elevation of a milling machine embodying this invention, certainv olf' the parts of the machine being broken away or entirely omitted for convenience in illusv tration; 2 is a vertical sectional view on the line 2-2 of Fig. 1; Fig. 3 is an enlarged. view of the locking device-syFig. 4 isa view similar toFig. 3 showing the loclrV ing position of the devices; Fig. 5is a sectional view on'the line 5-5 of Fig. 3v and gig. 6 lis a sectional view on the line 6-6 of eferring to the drawings where like nulmerals referto similar parts throughout, a

milling machine is illustrated as `mciuited on a base l and having projecting upwardlyl therefrom a column 2, a knee 3 being'vertically adjustable on guideways formed on the column walls and carrying a work table 4 thereon in the usual manner. The work table 4 carries the work 5 which is being operated upon by the cutter 6, the latter being carried by the arbor 7 which is mounted between the centre pin 8 and the inner end of the spindle 9. The spindle 9 is journaled in the walls of the hollowA column `2. the outer bearing being designated generally at 10 and comprising the usual reversely tapered sleeves 11. The spindle y9 carries on its overhanging end a hand wheel 12, the latter being loosely mounted thereon but capable of movement longitudinally of the spindle for clutching engagement with a cooperating clutch member 13,'the latter being threaded to the spindle 9. By means of this hand wheel the spindle 9 may be adjusted to any desirable angular position. On the lower part of the column 2, below the spindle 9 and parallel thereto, is journaled a transmission shaft 14 which maybe driven from the power means or pulleys 15 throughthe cooperation of clutehmembers 16 and 17. The clutch member 16 is liXed to rotate with the pulley 15 and the clutch member 17 comprises a sleeve slidably keyed to the shaft 14. The sleeve 17 bemoved yback and forth by .meansv of a pair or arms 18 projecting downfrom a cylindrical memn ber `19 which is journaled to the shaft 20, the latter being mounted above and at right angles to the shaft 14, and being journaled in suitable bearings formed in the walls of the column casing. The arms 18 carrytrunnions which playin an annular raceway formed in the vperiphery of the sleeve of the clutch member 17. "To the cylindrical struc.n ture 19 vis fixed a crank `arm 22 and this crank arm isconnected by 'means of the conneeting link 23 with a crank arm 24 fixed to an oscillating shaft 25 mounted above the -level of the shaftl 20 but parallel thereto 4The shaft 14 may be geared to the spindle 9 through a system of variable speed gearing, this speed gearing forming no part of the present invention. By means of this gearing referred to, which vis designated generally by numerals 27, 28 and 29i the spindle 9 may be driven at various specie to cause the cutter 6 to operate on the work 5, a spur gear 30, which is in mesh with thiA` gear 29 being fixed to the spindle :9 within the hollow colulnn 2 for driving the same. n a side wall yof the column 2 and in alignment with the spur lgear 30 is formed an opening and in this opening is anchored' a closely fitting cylindrical member 3l, the latter projecting inwardly at right angles tothe spindle and in close proximity to 'the periphery of the spur gear 30. The inner end 'of the cylindrical member 3l is 'open but its outer end is closed by meansof an integral flanged plate 32, the plate 32 being larger than the cylindrical member 3l and adapted to be'secured to the column wall in .any suitable manner, as by means of screw bolts 33. Vithin the cylindrical ymemberb vis disposed a plunger the inner end of which has spur-teeth 35 which are adapted to intermeshor interlock with the teeth of the spur gear 30 when the plunger is actuated in a direction to lock the spur gear 30 andspindle 9 in afstationary position. rlhe plunger is provided on its outer end with a centrallongitudinal recess 36, the outer part of this recess-being provided with a screw thread for cooperation with an adjusting screw 37, and the latter being fixed to a stub shaft y38 which has a collar or annular shoulder 39 disposed between the screw 37 and the `flange plate32 and carries on its outer end an operating handle 40 for rotating the screw v37 and thereby advancing the plunger 34 towards or retracting it .from the spur gear 30. The handle 40 is provided with a spring pressed locking pin 4l, the latter being adapted to enter therecess 42 inthe flange plate'32 for .locking the shaft 38 `in a stationary position ,when vthe spur .teeth 35 are either engaged yer disengagrd withthe spur gear 30. The plunger 34 is formed on its upper lside with a curved longitudinal slot forthe reception of a key 43, the underside of the key 43 being curved to correspond with the curvature of the slot, and the upper part of the cylindrical `member 3l being provided vwith a longitudinal key-way t receiving and ,cooperating with the key for preventing the rotation of the plungerr34 when Ithe screw 37 is rotated. The shaft 25 has vfixed thereto a crank-arm 44, the latter being mounted to assume vertical position in the normal or unclutched positionof the power clutch, and this crank arm 44 has pivote'd thereto an interlocking rod 55, .the Vlatterprojecting,upwardly at an f angle to the vertical and the free end thereopening 46 are out of register. The open tion is as follows: lVhen it is necessary to make adjustments, either of the cutter or the spindle, the o aerator, by the manipulation of either of t e handles 26, throws out the power clutch 16, 1T. rlh'e throwing out of this clutch causes the withdrawal of the locking rod from the recess 4T in the y.

plunger 34 andthe operatormay then turn the handle 40 and thereby operatey the screw 3'? to advance the plunger teeth 135 into looking engagement with the spur teeth oir-the spur gear 30 the spur gear 30 and the spiny dle 9 being therebysecurely locked ina stai tionary position. Any adjustmentof the work 5, arbor 7 or critter Gemay thenbe made with absolute safety from inconvenience causedby the inadvertent starting of the machine while the .spindle is locked and the adjustments are being made, the power clutch i6, lbeing Ynow locked in the open position due to the out vof register positions of the opening 46 ,and the recess 47. The power clutch cannotibe throwninagain to start the machine until the plunger 34 is brought back to the retracted position `where the recess 47 registerswith the opening46. t is also obvious that the plunger' 34 cannot be advanced while the machine is operating since when the powerclutch is in operative position the free .endrof'the locking rod 55 passes through the opening 46 and enters the recess 47. Y

In accordance with lthe requirements of the statutes wehaveset forth ourinvention in the specic manner required and asembodied in one particular typeof machine tools, vbut it is understood .thatV .Certain features of the locking Amechanism may l.be equally a-daptedl to other types yof {machine tools and that theclaims hereto .annexed'are not to be `limited to the specific devices set forth except as is specifically recited therein or ,is rendered necessary by a consideration ofthe priorrart. y Y

Having thus described our inventionwhat we claim 1s i l, In. an apparatus of thetyipe.-described,

izo

las f ing comprising a spur gear fixed to said spindle, a power driven sleeve mounted on an end of said shaft, a clutch member keyed to and shiftable along said shaft into engagement with said sleeve, a cylindrical member anchored -in an opening in the side wall of said column and having a flange plate covering its louter end, said member` being on a level with but vat right angles to .said spindle and projecting inwardly' to a point closely adjacent the periphery of said spur gear, said cylindrical member having a transverse opening in one side thereof, a plunger disposed within said member and slidably keyed thereto, the inner end of said plunger having Spur teeth for engagement with said spur gear, said plunger having a central longitudinal recess formed on its outer end and a transverse recess on its side, a screw shaft journaled in said flange plate and having a screw threaded end cooperating with said central recess in the plunger for actuating the plunger, a bell crank lever for controlling'said'clutch member, an operating handle attached thereto, and a locking rod pivoted at one end to said lever and having its free end playing in vsaid transverse opening in the wall of said cylindrical member, said latter openingr being adapted to register withthe transverse recess in said plunger when the plunger is in the retracted position. Y

:2. In an apparatus of the type -described, a supporting frame work spindle journaled in said frame work, said spindle being adapted to receive an arbor on one end, a transmission shaft journaled in said frame work, a system of gearing interposed between said shaft and said spindle, said gearing comprising a spur gear fixed to said spindle, a power driven member journaled on said shaft, a clutch member keyed to and shiftable along said shaft into engagement with said member, a cylindrical member anchored in an opening in the side wall of said column, said member being on a level with but at right angles to said spindle and projecting inwardly to a point closely adjacent the periphery of said spur gear, said cylindrical member having a transverse opening in one side thereof, a plunger disposed within said member and slidably keyed thereto, the` inner end of said plunger having spur teeth for engagement with said spur gear, said plunger having a central longitudinal recess formed on its outer end and a transverse recess on its side, a screw shaft having a screw threaded end cooperating with said central recess in the plunger for actuating the plunger, a bell crank lever for controlling said clutch member, an operating handle attached thereto` and a locking rod pivoted at one end to said lever and having its free end playing in said transverse Opening in the Wall 0f Said cylindrical member, said latter openingf being adapted to register with the transverse recess in said plunger when the plunger is in the retracted position.`

3. In an apparatus of the type described, the combination of a spindle, a power shaft, a system of gearing interposed between said power shaft-and said spindle,v a power clutch interposed between said gearing and said shaft, control means for operating said power clutch, a locking device for locking one of the gears of said system in astationary position, and means interposed 'between said locking devices and said operating means for preventing the operation of the clutch while the gear is locked or preventing locking the gear when the power clutch is in operation.

4. In an apparatus of the type described, the combination of a power shaft, a spindle.v a system of gearing interposed between said spindle and said drive shaft comprising a spur gear, a power clutch interposed between said gearing and said power shaft, a locking member adapted to be advanced to a position in the path of the teeth of the spur gear and thereby lock the same in position, means for actuating said locking member, means for operating said clutch, and interlocking'connections between said actuating means and said operating means for preventing the operation of the locking device while the clutch is in engagement with the power shaft and preventing the operation of the clutch while the locking device is in operation. y

5. In an apparatus of the type described, the combination of a hollow column, a power shaft journaled in the walls thereof, a spindle also journaled in the walls thereof, a power transmission system interposed between said power shaft and said spindle, said system comprising a spur gear fixed to said spindle, a power clutch interposed between said power shaft and said system of gearing, a locking member mounted in one of the walls of said column, said locking member being movable at right angles to said spindle and adapted to engage the teeth of said spur gear to lock the spindle against rotation, means for advancing said locking member toward said spur gear, and interlocking connections between said power clutch and f shaft Iand said spindle, said system comp-rising a Spui-gear fixed to said spindle, -a power clutch interposed between said shaft and said power driven member, a locking inember mounted in one of 'the walls of said column, said locking member beine# movable at right angles to said spindle and adapted to engage the teeth ofsaid spuigear to lock thespindle against rotation means for advancing said locking member toward said spur gear, and interlocking connections between said power clutch and said locking member, said connections being adapted to obstruct the advancement of either the :power clutch or the locking inember while the other is in operative position.

7. In apparatus of the type described, the combination of a column comprising ahollow rectangular casing,'a power shaft journaled in the walls thereof, a spindle lalso journaled in the walls thereof, a system of gearing interposed between said spindle'and sai-d power shaft 'comprising a spur -gear fixed to said spindle, 'a power clutch in terposed between 4said system of gearing Aand said power shaft, a cyl-indrical memberanchored in a side wall of the column and projecting toward the rperiphery o'f said spur gear and at right angles to the spindlep a plunger slidably keyed within said cylindrical member, said plunger having spur teeth adapted to lengage the teeth of said spur gear in theladva'nc'ed position thereof, said plunger'also having a screw threaded opening in one end, a Hand operated screw cooperating with said threaded'opening for ad'vancing'the plunger,l sai-d cylindrical membei` having a transverse opening *in* one side thereof andlsaid plunger `having a transverse Irecess adapted 'to register with said opening in the retracted position oftheplunger, hand'operatfed "mechanism for operating vsaid clutch anda ylocking rod-pivotedv thereto and having its free end disposed within said transverse opening in said cylindrical member and adapted to enter said recess when `the clutch is in engagement with the power shaft.

8. In apparatus of the type described, the combination of a column, a power shaft journaled 'therein7 a spindle also journaled therein, a system of gearing interposed between said spindle and said power shaft comprising a spur gear fixed to said spindle, a power clutch interposed between said system of gearing and said power shaft, a cylidrical member anchored in said column and projecting toward the periphery of said spur gear and at right angles to the spindle1 a plunger slidably keyed within vsaid cylindrical member, said plunger having spur teeth on its forward end adapted to engage the teeth of said spur gear in the advanced position, said plunger also having a screw threaded opening in its rearward end,'a hand operated screw for coopera-ting with said threaded opening Aand advancing the plunger, said cylindrical member having a transverse opening in one side thereof and said plunger having a transverse recess its free end disposed within said transverse opening in said cylindrical member, said rod being adapted to enter said recess when the clutch is in engagement with the power shaft ibut to be withdrawn therefrom when the clutch is in operative position.

In testimony whereof,we hereunto affix our signatures.

FRANK s. siiinLDs. JOHN A. oAMM. 

